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Jake Fontana, Jawad Naciri, Ronald Rendell and Banahalli R. Ratna Macroscopic Self-Assembly and Optical Characterization of Nanoparticle–Ligand Metamaterials Advanced Optical Materials 1

Version of Record online: 31 JAN 2013 | DOI: 10.1002/adom.201200039

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Self-assembly of macroscopic gold nanosphere–ligand films is demonstrated to produce optical metamaterials. Using phase separation and surface tension gradients nanoparticles are capped with thiol ligands, self-assembled into macroscopic monolayers and transported onto non-functionalized substrates. By measuring the real and imaginary parts of the phase shift of light transmitted through the self-assembled films a positive near-zero index of refraction at visible wavelengths is demonstrated.

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